Boring-tool



(No ModeL) I H. M. KNIGHT.

BORING TOOL. No. 856,188. Patented Jan. 18,1887.

3%, WW WWW N WITNESSES through line 2; c, Fig. 1.

UNrr-E STATES HENRY M. KNIGHT, OF LANCASTER, PENNSYLVANIA.

BORING -TOOL.

SPECIFICATION forming part of Letters Patent No. 356,138, dated January18, 1887.

Application filed October 7, 1886.

To all whom it may concern.-

Be it known that I, HENRY M. KNIGHT, a citizen of the UnitedStates,'residing at Lancaster, in the county of Lancaster, State ofPennsylvania, have invented certain Improvements in Boring-Tools, ofwhich the following is a specification.

My invention relates to improvements in boring-tools for cutting out orenlarging openings already made; and it consists in the combination andarrangement of a number of parts, operating in the manner hereinafterdescribed.

In the accompanying drawings, making part of this specification, Figure1 is a plan View of my tool; Fig. 2, a longitudinal section of the same;and Fig. 3, a transverse section cut Similar letters refer to similarparts throughout the several views.

The object of .my invention is to construct a boring-tool havingdetachable blades or bits capable of such adjustment that the diameterof the tool may be readily increased ordiminished.

\ This invention consists in a shank having a cutter-head, in slots inwhich the blades are carried, the shank and cutter-head having a bore,in which a bearing-rod with a conical end, on which the blades rest, ismade adj ustable.

The shank A, having a cutter-head, B, at one end, has a bore extendingthrough said cutter-head and so much of the shank as may be necessary toafford room for the movement of the bearing-rod G and the action of itsoperating mechanism. The periphery of the shank, from the rear of thecutter-head to the stem R, has a screw-thread cut therein, upon whichthe set and jamnuts, hereinafter described, operate. The cutter-head hasradial slots b cut therein, which carry the blades D. These blades restupon the conical shaped end 0 of the rod G, and have the edges uponwhich they rest of a shape to conform with the taper of the cone. Theshank A has slots a cut through it into the bore from the cutterheadback the full length of the bore. Teats T on the rod G project throughthese slots,

Serial No. 215,640. (No model.)

and are engaged by set nuts N, which serve to regulate and hold the rodin position. The slots 12 are cut through the rear end of thecutter-head, so as to permit the inner ends of the blades to projectsomewhat beyond it, as shown at d. The jam-nut E serves to keep theblades in position when set, the inner end of the blades sloping outwardfrom the cutting-edge to the base, as shown at m, Fig. 2, in order thatthe nut may hold it more securely.

As will be readily understood, the blades are set by loosening thejam-nut E and the set-nut N on the side of the teats T toward which therod is to be moved. The other setnut is then screwed up to force the rodinto the position required, the movement of the rod back or forthregulating the distance the blades are to project and, the diameter ofthe bore to be cut by them. Blades of different sizes can be used, asmay be required by the work to be performed.

I wish it understood that I do not confine myself to any particular sizeor proportion or the kind of material used in the construction of myimproved tool, for the same may be varied to suit the judgment of themechanic making and using it, and the same general result be obtained.

Having thus described my improvement, What I claim as my invention, anddesire to secure by Letters Patent, is

1. The combination, with a tool having screw-thread cut in the peripheryof the shank thereof and a slotted cutter-head, and a bore extendingthrough said shank and cutter-head,

3. The e0n'1bination,-Witl1 a tool having a said rod in position,adjustable, blades, and slotted cutter-head and a bone extendingjam-nuts for securing the same, substantially through the shank andcutter-head, of a rod as specified.

having a cone-shaped bearing end and pro- HENRY M. KNIGHT. 5 jectionsextending therefrom through slots in WVitnesses: said shank, means forengaging said projec- W. J. FORDNEY,

tions for the purpose of setting and holding a \VM. R. GERHART:

